Cutoff device for tubing



A. E. CHERNACK CUTOFF DEVICE FOR TUBING April 3, 1951 I 2 Sheets-Sheet 1 Filed Dec. 30, 1946 flwenfor Abe/ E. Cher/200k By Ms A flomeys P 3, 1951 A. E CK 2,547,375

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4 /n van/0r 409/ E C/zemac/r By fills Attorneys Patented Apr. 3, 19 51 cUToFF DEVICE FOR TUBING Abel E. Chernack, Bloomfield, Conn.; Mary Chernack, executrix of said Abel E. Chernack, deceased, assignor, by mesne assignments, to Wiremold Company, Hartford, Conn a corpo- I ration of Connecticut f This invention relates to devices for cutting tubing. In the making of tubing from continuous strip material, the lengths of tubing desired are very often short and as .the tubing i produced in a continuous length, it has been necessary either to cut the continuous tubing into the desired lengths after manufacture or to stop the machine making the tubing after a desired length has been made in order to sever it. One method requires additional labor and the other requires the repeated stopping and starting of the machine with a consequent loss of production for the machine and an increase in the unit cost of the product. Hence,.an object of this invention is to provide means for automatically and repeatedly cutting tubing as it is produced without stopping the manufacture thereof. It is a further object of this invention to provide means of the type described which permits of readily changing the length ofthe sections lIltO' WhiCh the tubing is cut.

Other objects and'advantages of the invention will become apparent as it is described in connection-with the accompanying drawings.

' In the drawings in which there is illustrated a preferred embodiment of this invention:

Figl'l is a perspective view of a device in-accordanc with this invention, the device being shown attached to a tube forming machine, only such parts of the tube forming machine being shown as are necessary to show the relation of the device thereto, parts of the device; being broken away to show other .parts more clearly;

i 'Fig. 2 is a top plan view of the structure shown in Fig. 1; I I

' Fig. 3 is a view in elevation of the cam faces of an adjustable cutter controlling cam; Fig. 4 is a side View of the cam of-Fig. 3; -'--Fig; 5 is a view in elevation of the ca'm face of a second'cutter controlling cam; and Fig. 6 is a side view of the cam of Fig. 5.

In. the drawings, a cut-off device in accordance with thisinventi-on is shown applied to a tube forming machine I designed to form tubing from a'continuous metal strip 2 and a continuous textile fabric strip 3.1. The machine comprises power-driven rolls 4 which shape the metalstrip 2.,iand assemble the metal and textile strips into a single continuous strip which is formed into a spirally .woundrtubing 5 on a short continuously rotating mandrel (not shown)" driven from the shaft of one:-;ofthe rolls 4 through gearing 3.

The'cut-oifdevice comprises a chisel cutting means In secured in a head I pivotally connected to a, pIungeriIZ' slidablyniounted in a suitable Application December so, 1946, Serial No. 719,215

14 Claims, (01. 164 61) support I4 carried by a bracket I6 mounted on the bed plate 8 of the machine. The plunger I2 is biased by. a spring .I8 compressed between a shoulder I 2a on the plunger I2 and the inner wall of a recess in the support I4. The plunger l2 projects above the support I4 and has mounted on its threaded, upper end a cam follower 28 adjustably positioned on the plunger I2 by lock nuts 22. The cam follower 28 projects into position to engage the face ,of cam 23 rotatably mounted on the. support I4 and rotated by a worm wheel 24 secured to the; cam 23 by bolts 26. Rotation of the cam 23 permits the cutter II] to be operated by the spring I8 to out the metal strip of theltubing when the raised portion 23a passes from beneath the cam follower 28. Nuts 2| ad justably positioned on the plunger I 2 limit the downward movement of the cutter.

Secured between the worm wheel 24- and the cam 23 by the bolts 28 are cam disks 27 and 28 having arcuate slots as at 28b to receive the bolts 26 and permit relative adjustment of the disks 21 and 28. The edges of the disks 2I and 28 are cut away at 21a and 28a, respectively, to form a depressed portion the length of which may be varied by relatively adjusting the cam disks 2! and 28. Engaging the edges of the cam disks 2'! and 28 is a cam follower 30 adjustably mounted on an arm 32 which is pivotally mounted on the support I4 and carries a roller cutter 34 positioned to engage the textile strip of the tubing.

A spring 36 connected to the arm 32 and support I4 biases the arm 32 to hold the cam follower 30 against the: cam disks 2'! and 28, and operates the arm 32 to bring the cutter 34 into engagement with the textile portion of the tubing when the cam follower 30 engages the depressed portions of the edges of the cam disks. In practice the disks 2] and 28 are adjusted so that the cutter 34 engagesthefabric portion of the tubing for a complete revolutionrof thetubing. Howbox adjustably mounted in a suitable support 42 secured to the support l4. Fixed on the opposite end of theshaft lo is a, gear 44 which meshes with an idler gear 46 journaled on a stub shaft 48 adjustably mounted on thesupport 42. The idler gear 46 meshes with a gear 50 fixed on an end of a shaft 52 journaled in the support 42 and having fixed on its other end a bevel gear 54.

The geanie meshes withia bevergearfifi fixed on:

the upperend of a vertically arranged shaft; 5'?! journaled in the support 42 and having fixed thereon adjacent its other end, a worm 58 which.

engages the worm wheel 24.

When the tube forming machine is'in operation, the strips 2 and 3 are. joined and: then.

spirally wound on the mandrel toiforrmthatuba ing 5. Operation of the forming rolls E-d'rives thegear 44 through the chain 33': The gear M,- operating through the gear train and. worm and worm wheel operates the cams: 2-3; and; Zlqand 28;.

Operation of the cam 23 causes the operation of the cutter H) to sever the metallic stri'p'on'tlie. mandrel. In order to operate the cutter after the formation? of a; predetermined. length. of tubing: the gear 44 may be changed to provide a. gear-- i'ng ratiosuch that the cam'.-2'3? will make=a single; revolution and cause: the operation of. the cutter l after the predeze'rm'ined'. length. is formedi Mounting the-shaft 4B in a journal box. adjustable" inthe support dlr permits ofiadj llstillg gears 4'8} of different diameters: to properlymesh. with. theidler gear 46 I The cams 21 and? 28: are mounted? to revolve with the cam- 2-3. The makingof -hES6TCamS-1 e1a:-* tively adj ustable' permits of varying. the; period. of" engagementof the cutter roll 34 the fabric of the. tubing on the mandrel so: as to: ensure engagementof the cutter 3J4? withthei tubingifon one complete revolution of the tubing irrespective: of the di'ameteriof the tubing" or thelengthof: the sections into which the tubing: is divided;

' From the foregoing. ittmay'be observed thatthe ohisel cutter I0 cuts through: the metal? part" of; the: tubing asthe: cutter descends to the mandrel on -whi'ch the-tubing is being formed;- This out, being in an axial or? longitudinal; direction; only partially severs the fabric. strip. which is" betweentlie adjacent co'nvolutions,v of the metal strip; Completionof the cutting of the fabric is. accomplished by the rotary: cutter: 34': which is pressedagainst the mandrel within-the. tubing by spring 36 as described. This cutting is peripheral and need only proceedv from the axial out until the tubing has completely" revolved to:- bring the axial out again under the rotary cutter so that the two outs intersect at beginning and end. The two outs thus completely sever the tubing;

It isappa'rent that ihei invention While particularly useful for severing tubing made of metal and f 'a'bric, i's" useful also; for tubing of metal and an flexible or collapsible material equivalent to fabric. Hence; in the appended claims the word fabric includes' such equivalents.

Modifications within. the. scope of theinven tion will. occur tothosea skilled? in the art. The invention. therefore is not limited to the. specific embodiment shown What. is-cl'aimed' is 1 In; a cut-off device for continuous tube forming machines, dual cutting'means comprising a reciprocating cutter making a longitudinal out and a r'olary cutter making a; peripheral cut intersecting said longitudinal out; and means operated-by'sai'd tube forming machine for operating said. cutting means to out the tubing intouniform lengths;

2; In: a cut-off device. for continuous tube forming machines,. dual: cutting means: c0mpris-- 4 ing a reciprocating cutter making a longitudinal out and a rotary cutter making a peripheral out intersecting said longitudinal cut, cam means controlling the operation of said cutting means,

- cutting. chiseland: predetermined applications of said cutting Wheel on the periphery of the flexiblt material to cut the composite tubing into uniform lengths.

42in: a'. cut-ofi' device for machines; forming continuous spirally wound composite metal andi fabric. tubing, metal. cutting means, fabric cutting; means; means operatingsaid met-alcuttingmeans. tosever themeta} by a stroke, means operating said fabric outing meansv to sever the: fabric. during; a. predeterminedperiod, and means: oper' ating. said: cutting, opera-ting means from the-tube forming' machineto out the tubing into uniform:

, lengths.

5. Ina cut-off devicefor rotating; compositemetal and. fabric tubini-r.v a. outing; chisel, a cut:-- ting wheeL. means; operating; said. cutting, chisel: to: sever the. metal b a blow, and means operata ing; the: cutting wheel; to sever thev fabric by a completerevolutionoff the tubing.

6., In. a cut-off. device for. rotating composite metal. and fabricatubihgg. a. cutting chisel for. cuteting the metal. of. said; tubing, cam'means con- I trolling. said. cutting chisel, a; cutting Wheel; for:

cutting the fabric of said tubing cam; means: rendering said cutting. wheel operative: during, a complete revolution of the tubing and means: operating said cam means to cut the: tubing.

7. In a cut-off device'for rotating and advancing composite-metal and fabric tubing, a cutting. chisel for'cutting the. metal of the. tubing, spring means for operating said cutting chisel, cam means controlling said cutting chisel, a cutting wheel for cutting fabric of said" tubing, spring. means for engaging; said cutting wheel with. the; fabric, asecond cam means-controlling the operation of said cutting. wheel, and. means operating. said cam means to operate said cutting means upon a predetermined advance of the tubing-.-

8. Ina cut-ofidevice forrotating and adv-ancing hollow composite metal and fabric tubing; of. the type: having; helical convolutions of metal with: fabric-between, them;, cutting means severing a convolution of the; metal. of. the tubing; cutting means. acting, circumierentially' to sever the: fabric. of. the tubing, and. means operating said. cutting means: upon a predetermined ad.- Vance of the tubing.

9... In a cut-off device for rotating and'advan'cing' hollow composite metal and. fabric tubing of: the. type having; helical'convolutions. oi metal with fabric between. them, cutting-jmeans forv the" metal .of the tubing. cuttingmeans. acting transr: versely to the axis of thetubing the. fabric of: the tubing; operating means for: said cutting means, andmeans initiatingithe. operation ofisaid. opera ing means upon a predetermined. advance of saidv tubing,

10. In acut-off device for-rotating andadvanciing composite metal and fabric tubing, a cutting chisel for cutting the metal of the tubing, spring means for operating said cutting chisel, cam means controlling said cutting chisel, a cutting wheel for cutting fabric of the tubing, spring means for engaging said cutting wheel with the fabric, a second cam means controlling the operation of said cutting wheel, said second cam means being adjustable to vary the operative period of said cutting wheel, and means operating said cam means to operate said cutting means upon a predetermined advance of the tubing.

11. In a device for cutting-oil" rotating and advancing composite metal and fabric tubing, a flat cutting edge for cutting the metal of the tubing, spring means for operating said cutting edge, a cam controlling said cutting edge, a cutting wheel for cutting the fabric of the tubing, spring means for engaging said cutting wheel with the fabric, a plurality of relatively adjustable cams controlling the engagement of said cutting wheel with the fabric, said cams being relatively adjustable to vary the operative period of said cutting wheel, and means operating said cams to operate said cutting means upon a predetermined advance of the tubing.

12. In a device for cutting-off rotating and advancing composite metal and fabric tubing, a flat cutting edge for cutting the metal of the tubing, spring means for operating said cutting edge, a cam controlling said cutting edge, a cutting wheel for cutting the fabric of the tubing, spring means for engaging said cutting wheel with the fabric, a plurality of cams having cooperating cam faces controlling the operation of said cutting wheel, said cooperating cam faces being relatively adjustable to vary the operative period of said cutting wheel and means operating said cams to operate said cutting means upon a predetermined advance of the tubing.

13. In a device for cutting-off rotating and advancing continuous tubing, a mandrel on which the tubing is formed, cutting means cutting the tubing on the mandrel, a plunger, guiding means for said plunger, means pivotally connecting said plunger and cutting means, a spring for operating said plunger, a cam follower carried by said plunger, a cam engaging said cam follower and controlling operation'of said plunger, and means operating said cam to initiate operation of said cutting means upon a predetermined advance of the tubing. 7

14. ;In a device for cutting-01f rotating and advancing composite hollow metal and fabric tubing, 3, cutting Wheel acting transversely to the axis of the tubing, means for engaging said cutting wheel with the tubing, cam means controlling the engagement of said cutting wheel with the tubing, said cam means being adjustable to vary the operative period of said cutting wheel, and means operating said cam means to initiate operation of said cutting wheel upon a predetermined advance of the tubing.

ABEL E. CHERNACK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 677,126 Gilbert June 25, 1901 763,124 Stewart June 21, 1904 873,430 Harter Dec. 10, 1907 982,770 Patterson Jan. 24, 1911 1,501,774 Heeter July 15, 1924 1,955,410 Colbie Apr. 17, 1934 2,160,497 Garrett May 30, 1939 2,319,198 Barrans May 18, 1943 2,404,424 Balla July 23, 1946 

